EP3127377B1 - Procédé d'économie d'énergie pour terminaux mobiles dans un réseau sans fil - Google Patents

Procédé d'économie d'énergie pour terminaux mobiles dans un réseau sans fil Download PDF

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Publication number
EP3127377B1
EP3127377B1 EP14726900.5A EP14726900A EP3127377B1 EP 3127377 B1 EP3127377 B1 EP 3127377B1 EP 14726900 A EP14726900 A EP 14726900A EP 3127377 B1 EP3127377 B1 EP 3127377B1
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Prior art keywords
coding
user equipment
base station
channel
needed
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German (de)
English (en)
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EP3127377A1 (fr
Inventor
Hong Li
Kari Leppanen
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0245—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal according to signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of wireless network communication and particularly to wireless communication between a base station and user equipment and still more particularly to the provision of an energy saving communication between a base station and user equipment.
  • the basic modules of wireless transmitter and receiver are illustrated diagrammatically in figure 1 in which a digital signal 1 comprising bits are provided to an encoder 2 providing an encoded version of the input digital signal 1 which after modulation in a modulator 3 is provided to a power amplifier 4 that provides the necessary high frequency power to the transmitter antenna 5.
  • the transmitter antenna 5 transmits the encoded and modulated signal via a channel 6.
  • the transmitted signal is received by a receiver comprising an antenna 7 and a low noise amplifier (LNA) 8. After amplification, the received signal is demodulated in a demodulator 9 and the demodulated signal is decoded in a decoder 10 that provides the resulting output digital signal 11.
  • LNA low noise amplifier
  • coding schemes there are many coding schemes described in the literature, e.g. Turbo coding, LDPC, etc.
  • Different coding schemes have different characteristics of processing complexity and decoding performance, but the general laws for most of these coding schemes are: (1) better coding performance implies more processing complexity, and (2) the process of decoding is usually much more complicated than that of encoding.
  • 3GPP LTE 3 rd Generation Patrnership Project Long Term Evolution
  • Turbo coding is mainly used.
  • Turbo coding is characterized by its complexity of decoding, but encoding of the Turbo coding scheme is much less complicate than decoding. More complexity usually means higher energy consumption.
  • P 0 is a parameter that has a specific and nominal part. It is measured in dBm, expressing the power to be contained in one Physical Resource Block (PRB). P 0 can be seen as the reference power per PRB for the case of no path loss and no offsets.
  • the parameter M denotes the number of allocated PRB.
  • the parameter PL refers to the estimated path loss while the Fractional Path Loss Compensation (FPLC) factor ⁇ allows for a tradeoff between cell capacity and inter-cell interference.
  • FPLC Fractional Path Loss Compensation
  • the parameter ⁇ TF represents a Modulation and Coding Scheme (MCS) dependent offset and f stands for additional Closed Loop (CL) power control commands from the eNodeB.
  • MCS Modulation and Coding Scheme
  • CL Closed Loop
  • Adaptive Modulation and Coding Scheme In the 3GPP LTE system the Adaptive Modulation and Coding Scheme (AMCS) is also used.
  • the fundamental idea of Adaptive Modulation is to dynamically adapt the modulation and coding scheme to the channel state conditions to achieve the highest spectral efficiency at all times in accordance to link quality degradation.
  • the algorithm in focuses on how to reduce the transmission power of UE on the uplink connection with no optimization on the downlink connection.
  • the downlink connection usually has much more heavy traffic than the uplink connection in a real wireless communication system and consequently a large amount of energy of wireless terminals is consumed on the downlink connection when receiving data from the base station and performing the internal process.
  • the existing adaptive modulation and coding scheme mainly focuses on improving the system capacity, but the energy efficiency of mobile terminals is not taken into account. And the operation of coding is always performed in the real wireless system, e.g., LTE system and method, although the coding rate may change sometime. In theory, an un-coded system also may alternatively be used. Nevertheless, the prior art AMCS performs the same coding scheme for both downlink and uplink connections, either coding with the same coding scheme or no coding, without considering the channel difference of the downlink and uplink connections.
  • WO 2005/065 056 A2 discloses a method to determine the most appropriate channel coding scheme to be used when a user equipment returns from sleep mode and resumes communication with a base station.
  • the base station transmits a traffic indication to the user equipment, causing it to wake up.
  • the user equipment transmits channel quality information to the base station, and this information is used to negotiate an appropriate channel coding scheme.
  • the above and further objects and advantages are obtained by a method according to which it is determined if channel coding is needed on a downlink connection between a base station and a user equipment in a wireless communication system, based on given criteria.
  • the criteria can for instance be a static condition or a dynamic event triggered by the user equipment or the base station.
  • the base station modulates and transmits the source bit data to the user equipment directly if channel coding is determined, based on the above mentioned criteria, not to be needed. If, on the other hand, channel coding is determined to be necessary, the most energy efficient coding scheme is selected. According to an implementation of the invention, the coding scheme is optimized for target energy efficiency for the user equipment with the constraint that the capacity of the user reaches a certain level.
  • a method for saving energy for user equipment in a wireless network comprising based on a decision obtained by a decision function determining based on predetermined criteria if channel coding is needed on a downlink connection between a base station and a user equipment and if said coding is determined to be needed, selecting an appropriate coding scheme that yield energy saving for the user equipment upon decoding.
  • the base station modulates and transmits to-be-transmitted source bits without prior channel coding, whereas, if the coding is determined to be needed, the base station applies the channel coding to the to-be-transmitted source bits, and modulates and transmits the coded bits.
  • the user equipment applies channel coding on the uplink connection to the base station.
  • the user equipment could be a mobile device such as a mobile terminal.
  • the decision is made for each data flow or periodically.
  • the criteria is a static condition.
  • the static condition is the threshold of the Reference Signal Receive Power (RSRP) or the threshold of the Signal-to-Noise Ratio (SNR) or the threshold of the Signal-to-Interference-Noise Ratio (SINR) or the BIT Error Rate (BER).
  • RSRP Reference Signal Receive Power
  • SNR Signal-to-Noise Ratio
  • SINR Signal-to-Interference-Noise Ratio
  • BER BIT Error Rate
  • a channel model relating to the transmission between the base station and the user equipment is established in order to be able to make decisions on channel coding.
  • the criteria is a dynamic event triggered by the user equipment or by the base station.
  • the channel coding is based on a coding algorithm that is optimized for target energy efficiency for the user equipment with the constraint that the capacity reaches a predetermined level.
  • the most efficient coding scheme is selected if channel coding is determined to be used.
  • a measurement model collects information for making a coding decision, measuring channel quality and interference level experienced by the user equipment receiver.
  • the user equipment is a mobile device.
  • the system comprises a user node or user equipment and a base station.
  • the system comprises a user node or user equipment and a base station, where the system is comprises a decision function or module that is configured for determining if coding is needed on the downlink connection based on given criteria and, in case downlink coding is needed, determining the coding scheme to be applied.
  • the base station is configured to apply a coding scheme on the downlink connection to the user equipment only after said coding has been determined to be needed, wherein the coding scheme is selected so that it yields energy saving for the user equipment upon decoding, whereas the user equipment always applies a coding scheme on the uplink connection to the base station.
  • system further comprises a measurement function or module configured for collecting channel information of making decisions and/or for measuring channel quality and/or measuring interference level experienced by the user node or user equipment receiver.
  • the transmission between the user node or equipment and the base station takes place via an intermediate relay/pico node.
  • the transmission between the user node or equipment and the base station takes place via an intermediate relay/pico node.
  • an apparatus for saving energy for user equipment in a wireless network which apparatus comprises a processor configured for determining if coding is needed on the downlink connection based on given criteria.
  • the apparatus comprises a processor configured to determine a specific coding scheme to be applied and a processor comprising a measurement function or module that is configured for collecting channels information that is needed in order to make the required decisions relating to the need of coding and the coding scheme and for measuring channel quality and interference level experienced by the user node/equipment receiver.
  • a processor configured to determine a specific coding scheme to be applied and a processor comprising a measurement function or module that is configured for collecting channels information that is needed in order to make the required decisions relating to the need of coding and the coding scheme and for measuring channel quality and interference level experienced by the user node/equipment receiver.
  • the apparatus according to said example can in a practical implementation be placed anywhere in the system, as for instance on the network side, in a separate device physically independent from existing network devices, such as a base station or administrator device, or, alternatively, the determining function can be embodied into the above existing network devices.
  • FIG 3 With reference to figure 3 there is shown a flowchart illustrating the overall procedure of determining the coding scheme on a downlink connection according to an example embodiment of the method according to the invention.
  • a down link bit data flow 12 is provided to a first decision function, schematically indicated by step 13 in the flow chart, which function, based on predefined criteria, determine whether coding of the data flow is needed. If this is not the case, the un-coded data flow proceeds to the modulation and transmission step 23.
  • step 14 if it is determined by the decision function in step 13 that coding is needed, a choice of an energy efficient coding scheme is made in step 14 and in step 15 it is determined if the chosen coding scheme can be optimized. If this is not the case, the still un-coded data are coded in the coding step 20, after which the coded data are modulated and transmitted in step 21.
  • step 15 If it is determined in step 15 that it is possible to optimize the chosen coding scheme, this is done in step 16, after which the still un-coded data are coded in step 17. The coded data are then modulated and transmitted in step 18.
  • step 15 If on the other hand it is determined in step 15 that the chosen coding scheme cannot be further optimized, the still un-coded data are coded in step 20, after which they are modulated and transmitted in step 21.
  • step 13 If down link coding is determined in step 13 not to be needed, the source data 12 are provided to a modulator and transmitted as indicated by step 23.
  • a decision function in step 13 determines if coding on downlink is needed for some given criteria. The decision is made for each data flow or periodically.
  • the criteria can be a static condition, e.g. the threshold of Reference Signal Receive Power (RSRP).
  • RSRP Reference Signal Receive Power
  • the electromagnetic signal attenuates substantially in air due to path loss and shadowing etc. which depends on the channel environment between the base station and the user equipment. The electromagnetic signal attenuation will cause the received signal power at receiver to be less than the transmit power at the transmitter.
  • a channel model relating to the transmission between the base station and the user equipment is established in order to be able to make decisions on channel coding.
  • a given threshold of RSRP e.g., T dBm
  • T dBm a threshold of RSRP
  • the channel coding is not needed for this case, implying that the channel quality between the base station and the user equipment is good enough for data transmission without channel coding.
  • the RSRP at the user equipment is less than T dBm, the channel coding is needed.
  • the threshold of RSRP can for instance be obtained experimentally based on history information.
  • the static conditions can for instance be the following parameters: threshold of Signal-to-Noise Ratio (SNR), Signal-to-Interference-Noise Ratio (SINR), Bit Error Rate (BER), etc., but it is emphasized that the static conditions are not limited to the above mentioned parameters.
  • SNR Signal-to-Noise Ratio
  • SINR Signal-to-Interference-Noise Ratio
  • BER Bit Error Rate
  • the criteria can be a dynamic event, e.g. an event triggered by the user equipment or the base station.
  • the user equipment may request the network for energy saving.
  • a user with full battery equipment usually prefers Quality of Experience (QoE) at the expense of energy saving, but this preference may change to energy saving to prolong the device usage when the remaining battery charge becomes low and no charger is available.
  • QoE Quality of Experience
  • the user equipment may request the network for possible energy saving, even by sacrificing some quality of experience.
  • Some multimedia services e.g., online movie watching, could be a proper scenario in which to apply this scheme, in which the user equipment works on downlink receiving data from the network most of the time, large amount of energy is consumed on internal process, and the error rate of multimedia is relatively tolerant.
  • the event could be also be triggered by the base station, e.g. for simplifying the procedure of data processing at the base station if the measurement model that measures channel quality and interference level experienced by the user equipment receiver detects that the channel quality between the user equipment and the base station is good enough for data transmission without channel coding.
  • the base station modulates and transmits the source bit data to the user equipment directly, if channel coding is determined as not needed. On the contrary, if channel coding is determined to be needed, the most energy efficient coding scheme is selected among available coding schemes, e.g. Turbo, LDPC, BCH coding, etc. Different coding schemes have different characteristics of energy efficiency.
  • P e i ⁇ P e , R i > R P represents power, ⁇ is the number of edges connected to each variable nodes in LDPC decoder, r 0 is the theoretic achievable rate, P e is the given maximum error probability, B is the available bandwidth, and R is the target information rate (bps).
  • P e i and R i are the error probability and capacity of UE i respectively and where the abbreviation s.t. means "subject to”.
  • the optimization problem (2) can be solved by exhausting all the feasible solution, or by applying mathematic nonlinear programming algorithms or evolutionary algorithms.
  • the solution to the utility function is used to set parameters for LDPC coding.
  • a measurement function can collect channels information for making decisions, measuring channel quality and interference level experienced by the user equipment receiver.
  • FIG 4 there is schematically shown a first coding and modulating scheme between user equipment 26 and a base station 25 on downlink 28 and uplink 27 connections.
  • the user equipment 26 For a pair of communication peers in a wireless network, i.e. user equipment 26 and base station 25, the user equipment 26 performs always coding on the uplink connection 27, but on the downlink connection 28, the base station 25 modulates the original bits directly without coding when given criteria are met.
  • the criteria can for instance be a static condition or a dynamic event triggered by the user equipment 26 or by the base station 25.
  • FIG. 5 there is schematically shown a second coding and modulating scheme between user equipment 30 and a base station 29 on downlink 32 and uplink 31 connections.
  • the coding schemes on the downlink 32 and the uplink 31 connections can be selected based on different criteria, and the selections of coding scheme on the downlink 32 and uplink 31 connections are performed separately.
  • Downlink 32 and uplink 31 transmission select the most appropriate coding scheme from the candidate coding schemes separately, for instance selecting the most energy efficient coding scheme for terminals on downlink 32, and selecting the most transmission efficient coding scheme on the uplink 31.
  • a user equipment 30 with an energy constrained battery is much more sensitive to energy efficiency than a wire connected base station 29, whereas a base station 29 that is connected to a main power line shall principally focus more on improving system capacity.
  • FIG. 6 With reference to figure 6 there is schematically shown a third coding and modulating scheme between user equipment 35 and a base station 33 via a pico/Relay/WiFi 34.
  • the intermediate nodes 34 can be implemented in different forms, such as a pico base station, relay node, WiFi Access Point (AP), Femto, etc.
  • Three links are involved in the heterogeneous network: a direct link, an access link and a backhaul link.
  • the direct link is the link between the user equipment 35 and the base station 33 (nor shown in figure 6 )
  • the access link refers to the link 36 between the user equipment 35 and the Pico/Relay/WiFi 34
  • the backhaul link is the link 38 between the pico/relay/WiFi 34 and the base station 33.
  • the present invention also relates to a system for saving energy for user equipment in a wireless network, where the system is configured such that it is able to implement the method described above.
  • the system comprises a user node or user equipment 26, 30 and a base station 25, 29.
  • the system further comprises a decision function or module that is configured for determining if coding is needed on the downlink connection based on given criteria. If coding is needed, the function or module (or another function or module dedicated to this purpose) further determines which specific coding scheme is to be applied.
  • the system according to this embodiment further comprises a measurement function or module that is configured for collecting channels information that is needed in order to make the required decisions relating to the need of coding and the coding scheme and for measuring channel quality and interference level experienced by the user node/equipment receiver, etc.
  • the system comprises a user node or user equipment 35 and a base station 33.
  • the system further comprises a relay/pico node 34, via which the communication between the user equipment 35 and the base station 33 takes place.
  • the energy saving scheme proposed by the present invention can be well applied also to the heterogeneous network and system shown in figure 6 in the sense that the access link usually belongs to the range of short distance wireless communication.
  • Encoding/Decoding and modulating/demodulating are performed as normal wireless communication procedures on backhaul link, but on the downlink connection the coding scheme is determined according to the coding selection scheme described above.
  • the process of coding on both the uplink and downlink connection is removed for the access link.
  • the method and corresponding system according to the present invention have the very important advantage over prior art methods and systems that it saves energy for wireless terminals.
  • multimedia services could be an example of services in which the teachings of the invention can be advantageously applied.
  • the user equipment works on downlink receiving data from the network most of the time, no transmit power is consumed by the user equipment, a large amount of energy is consumed on internal processes, and the error rate is relatively tolerant. It is possible to be able to save more energy for user equipment by removing decoding for these kinds of services.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Claims (12)

  1. Procédé d'économie d'énergie pour un équipement utilisateur (26, 30, 35) dans un réseau sans fil, le procédé étant caractérisé en ce qu'il comprend
    la détermination (13), en fonction de critères, qu'un codage de canal est requis ou non sur une connexion de liaison descendante (28, 32, 39) depuis une station de base (25, 29, 33) vers un équipement utiisateur (26, 30, 35) et
    s'il est déterminé (13) que ledit codage n'est pas requis, la modulation et la transmission (23), par la station de base (25, 29, 33), de bits source à transmettre (12) sans codage de canal préalable (17, 20), tandis que
    s'il est déterminé (13) que ledit codage est requis, la sélection (14), par la station de base (25, 29, 33) d'un plan de codage, l'application (17, 20) du codage de canal aux bits source à transmettre (12), et la modulation et la transmission (18, 21) des bits codés, dans lequel le plan de codage est sélectionné de manière à produire une économie d'énergie pour l'équipement utilisateur (26, 30, 35) lors du décodage (10) ; le procédé comprenant en outre : l'application, par l'équipement utiisateur (26, 30) d'un codage de canal sur la connexion de liaison montante (27, 31) vers la station de base (25, 29).
  2. Procédé selon la revendication 1, dans lequel ladite décision est prise pour chaque flux de données ou périodiquement.
  3. Procédé selon la revendication 1 ou 2, dans lequel lesdits critères sont des conditions statiques.
  4. Procédé selon la revendication 3, dans lequel ladite condition statique est le seuil de la puissance de réception de signal de référence, RSRP, ou le seuil du rapport signal/bruit, SNR, ou le seuil du rapport signal utile sur brouillage et bruit, SINR ou le taux d'erreurs sur les bits, BER .
  5. Procédé selon l'une quelconque des revendications précédentes 1 à 4, dans lequel un modèle de canal se rapportant à la transmission entre la station de base (25, 29, 33) et l'équipement utiisateur (26, 30, 35) est établi afin de pouvoir prendre des décisions portant sur le codage de canal.
  6. Procédé selon la revendication 1 ou 2, dans lequel lesdits critères sont un événement dynamique dclenché par l'équipement utiisateur (26, 30, 35) ou par la station de base (25, 29, 33).
  7. Procédé selon la revendication 1, dans lequel ledit codage de canal (17, 20) est basé sur un algorithme de codage qui est optimisé pour un rendement énergétique cible de l'équipement utiisateur (26, 30, 35) avec la contrainte que la capacité doit atteindre un niveau prédéterminé.
  8. Procédé selon la revendication 7, dans lequel le plan de codage le plus efficace est sélectionné (14) s'il est déterminé (13) que le codage de canal (17, 20) doit être utilisé.
  9. Procédé selon l'une quelconque des revendications précédentes, dans lequel un modèle de mesure collecte des informations pour prendre une décision (13) de codage, mesurer une qualité de canal et un niveau de brouillage subi par le récepteur de l'équipement utiisateur (26, 30, 35).
  10. Procédé selon l'une quelconque des revendications précédentes, dans lequel des plans de codage différents sont utilisés sur la liaison descendante (28, 32, 39) et la liaison montante (27, 31), respectivement.
  11. Système d'économie d'énergie pour un équipement utilisateur dans un réseau sans fil, dans lequel le système est caractérisé en ce qu'il comprend un noeud utilisateur ou équipement utilisateur (26, 30, 35), une station de base (25, 29, 33), et une fonction ou un module de décision configuré pour déterminer (13) qu'un codage est requis ou non sur la connexion de liaison descendante (28, 32, 39) en fonction de critères donnés, et, si un codage de liaison descendante est requis, déterminer (14) le plan de codage à appliquer, dans lequel la station de base (25, 29, 33) est configurée pour appliquer un plan de codage sur la connexion de liaison descendante (28, 32, 39) vers l'équipement utilisateur (26, 30, 35) uniquement après qu'il a été déterminé (13) que ledit codage est requis, dans lequel le plan de codage est sélectionné de manière à produire une économie d'énergie pour l'équipement utilisateur (26, 30, 35) lors du décodage (10), tandis que l'équipement utilisateur (26, 30) applique toujours un plan de codage sur la connexion de liaison montante (27, 31) vers la station de base (25, 29).
  12. Système selon la revendication 11, le système comprenant en outre une fonction ou un module de mesure configuré pour collecter des informations de canal de prises de décisions (13) et/ou pour mesurer une qualité de canal et/ou mesurer un niveau de brouillage subi par le récepteur du noeud utilisateur ou de l'équipement utilisateur (26, 30, 35).
EP14726900.5A 2014-05-08 2014-05-08 Procédé d'économie d'énergie pour terminaux mobiles dans un réseau sans fil Active EP3127377B1 (fr)

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CN105900494B (zh) 2020-08-14
EP3127377A1 (fr) 2017-02-08
CN105900494A (zh) 2016-08-24

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